"We appreciate the contributions that Tony and Kenny have made during their time at Oklahoma," Stoops said. "We wish them both the best as they pursue their opportunities in the NFL."

SCOOPHD: OU PLAYERS TALKING ABOUT NFL LAST WEEK AT COTTON BOWL

Junior fullback Trey Millard announced he'd return for his senior season following the Cotton Bowl. Junior cornerback Aaron Colvin pondered a leap to the NFL during the build up to the Cotton Bowl, but hasn't announced a decision yet.

SoonerScoop.com spoke with a source close to Colvin late Sunday night about the timeline for his decision.

“(Sunday) was his first day to really talk to his family about it. No decision even close to being made,” said the source. “He’s just now really breaking it down. He’ll have a decision sometime soon, hopefully.”

To enter the draft, a player must sign a notarized petition forgoing any remaining NCAA eligibility. Juniors must declare for the draft by Jan. 15.

Stills' and Jefferson's decision comes just two days after No. 11 Oklahoma was pummeled 41-13 by ninth-ranked Texas A&M in the AT&T Cotton Bowl Classic. Neither player was made available for questions after the game.

Stills finished his career ranked third on the school's all-time reception list with 204 catches. This season -- his best as a Sooner -- he recorded team-highs and career bests in receptions (82), receiving yards (959) and touchdown receptions (11). The Encinitas, Calif native is projected to be a third-round pick CBSSports.com.

Jefferson recorded six tackles in the Cotton Bowl and accounted for a team-high 119 this season. He also contributed two interceptions.

The 5-foot-11, 212-pound free safety is projected to be a second-round pick in this year's draft by CBSSports.com. He was a 2012 All-America Second Team selection.